“I never saw the man. I understand now he wears his uniform when he goes in,” Trump told reporters at the White House during a Cabinet meeting on Tuesday when asked if Vindman was credible, tacitly questioning Vindman's decision to dress in his military uniform. “No, I don’t know Vindman at all. What I do know is that he said the transcript was correct.”

“Vindman, I watched him for a little while this morning, and I think he — I’m going to let people make their own determination,” Trump, who last month called Vindman a “Never Trumper,” continued.

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His remarks came as Vindman testified on Capitol Hill about a July 25 phone call he listened in on between Trump and Ukrainian President Volodymyr Zelensky.

“I’m in uniform wearing my military rank. I thought it was appropriate to stick with that. The attacks that I’ve had in the press and Twitter have marginalized me as a military officer,” Vindman responded to Stewart.

Trump on Tuesday also sought to distance himself from other witnesses, including State Department officials William Taylor and George Kent, both of whom testified last week.

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“I don’t know any of these people, other than I have seen one or two a couple of times,” Trump told reporters. “I don’t know who Kent is. I don’t know who Taylor is.”

Witnesses like Taylor, however, have described an effort by Trump administration officials to use a White House meeting and aid to Ukraine to press Kyiv for investigations sought by the president.

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Vindman, who told lawmakers on Tuesday that he never had any contact directly with Trump, said that the call was “improper” and that he reported it to the National Security Council’s top lawyer out of a “sense of duty.”

“I was concerned by the call. What I heard was improper, and I reported my concerns to Mr. [John] Eisenberg,” Vindman said Tuesday. “It is improper for the president of the United States to demand a foreign government investigate a U.S. citizen and political opponent.”

“It was also clear that if Ukraine pursued an investigation into the 2016 election, the Bidens and Burisma, it would be interpreted as a partisan play. This would undoubtedly result in Ukraine losing bipartisan support, undermine U.S. national security and advance Russia’s strategic objectives in the region,” Vindman continued.

Vindman, who also testified privately in connection with the inquiry last week, is one of several officials slated to testify this week about the Trump administration’s dealings with Ukraine.

Trump has questioned the credibility of witnesses as well as the whistleblower who filed a complaint about the call that alleged Trump used his office to solicit foreign interference in the 2020 election.